/*	
	Copyright (c) <YEAR>, Yury Y. Kuznetsov
	All rights reserved.

	Redistribution and use in source and binary forms, with or without modification, 
	are permitted provided that the following conditions are met:

	o Redistributions of source code must retain the above copyright notice, 
	  this list of conditions and the following disclaimer.
	o Redistributions in binary form must reproduce the above copyright notice, 
	  this list of conditions and the following disclaimer in the documentation 
	  and/or other materials provided with the distribution.

	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY 
	EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 
	OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 
	SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 
	INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 
	TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
	OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
	CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY 
	WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#ifndef YYKTOOLS_PROFILER_H
#define YYKTOOLS_PROFILER_H

#ifdef _WIN32
#	include <sys/timeb.h>
#	include <time.h>
#else
#	include <sys/time.h>
#	include <unistd.h>
#endif

namespace yyk {


class Profiler {
	typedef double millisec_t;

	millisec_t milliseconds() {
#ifdef _WIN32
		__timeb64 now;
		// MSVC 8 deprecates _ftime64(), so we want to suppress warning 4996
		// (deprecated function) there.
		// TODO(kenton@google.com): Use GetTickCount()?  Or use
		//   SystemTimeToFileTime()
#  pragma warning(push)          // Saves the current warning state.
#  pragma warning(disable:4996)  // Temporarily disables warning 4996.
		_ftime64(&now);
#  pragma warning(pop)           // Restores the warning state.

		return static_cast<millisec_t>(now.time) * 1000 + now.millitm;
#else
		struct timeval now;
		gettimeofday(&now, NULL);

		return static_cast<millisec_t>(now.tv_sec) * 1000 + now.tv_usec / 1000;
#endif
	}

	millisec_t t0, t1;
public:
	Profiler() {}

	void start() { t0 = milliseconds(); }
	void stop() { t1 = milliseconds(); }

	double elapsed() { return t1 - t0; }
};

}

#endif

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